Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Net income	$ 124.8	$ 1,801.9	$ 72.7
Foreign currency translation adjustment
Foreign currency translation gain (loss)	62.8	69.0	(147.8)
Unrealized (loss) gain on net investment hedge	(13.2)	(31.7)	75.8
Net reclassification for loss to income from continuing operations	2.4	0.0	0.0
Foreign currency translation adjustment before tax	52.0	37.3	(72.0)
Deferred tax effect	0.1	7.0	(20.0)
Net unrealized gain (loss) on foreign currency translation	52.1	44.3	(92.0)
Unrealized (loss) gain on derivative instruments
Unrealized (loss) gain on derivative instruments before reclassification	(20.0)	(35.3)	30.7
Unrealized (loss) gain on derivative instruments after reclassification	(4.8)	(20.8)	8.1
Deferred tax effect	1.2	5.4	2.3
Net unrealized (loss) gain on derivative instruments	(3.6)	(15.4)	10.4
Defined benefit pension (loss) gain
Defined benefit pension (loss) gain before reclassification	(5.3)	(0.8)	18.3
Defined benefit pension (loss) gain after reclassification	(4.3)	(0.1)	21.8
Deferred tax effect	1.3	(0.1)	(8.9)
Net defined benefit pension (loss) gain	(3.0)	(0.2)	12.9
Deconsolidation of discontinued operations	0.0	26.1	0.0
Net change to derive comprehensive income for the periods	45.5	54.8	(68.7)
Comprehensive income	170.3	1,856.7	4.0
Comprehensive income (loss) from continuing operations attributable to non-controlling interest	0.1	0.3	(0.4)
Comprehensive loss from discontinuing operations attributable to non-controlling interest	0.0	0.0	(0.5)
Deconsolidation of discontinued operations attributable to non-controlling interest	0.0	0.8	0.0
Comprehensive income attributable to controlling interest	170.2	1,855.6	4.9
Continuing Operations
Unrealized (loss) gain on derivative instruments
Net reclassification for loss (gain) to income from operations	15.2	12.2	(20.2)
Defined benefit pension (loss) gain
Net reclassification for loss to income from operations	1.0	0.8	3.6
Discontinued Operations
Unrealized (loss) gain on derivative instruments
Net reclassification for loss (gain) to income from operations	0.0	2.3	(2.4)
Defined benefit pension (loss) gain
Net reclassification for loss to income from operations	$ 0.0	$ (0.1)	$ (0.1)